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Chapter 8 Rake problem

I'm new at this so I'm hoping one of you can point me in the right direction to troubleshoot this problem. On page 240, I get an error running the "rake db:migrate" command. As you can see from the trace below,

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.first

the error seems to be a missing element. How should I go about finding what array is missing, assuming that's the problem?

First thing I always do in this project is reverse my steps to a place where I know it worked. Somewhere in that margin there may be a code error. Try using the code download from the site and compare.